Niwa Nagashige, the eldest son of the loyal general Niwa Nagahide under Oda Nobunaga, entered the realm of warfare at the tender age of 12. His initial taste of battle occurred alongside his father during the confrontation against Shibata Katsuie under Toyotomi Hideyoshi at the Battle of Shizugatake. In the following year, at the age of 13, Nagashige stepped into the shoes of his ailing father and led the Niwa army at the Battle of Komaki-Nagakute.

Tragedy struck at the age of 14 when Niwa Nagashige found himself thrust into the position of the head of the Niwa clan and in charge of his father's extensive 1,230,000 koku estates following Nagahide's passing. While Nagashige's father was wed to an adopted daughter of their master, Oda Nobunaga, Nagashige's union was with Ho-onin, the actual 5th daughter of Nobunaga.
The shifting tides of power and alliances brought challenges to Nagashige's legacy. Accused of treachery during the 1585 attacks on the Toyama region, Toyotomi Hideyoshi demoted Nagashige from 1,230,000 koku to a mere 150,000 koku. Further setbacks occurred two years later during the Kyushu subjugation, with Nagashige's income reduced to a meager 40,000 koku. However, his valor at the Siege of Odawara led Hideyoshi to restore his fortunes, elevating his income to 120,000 koku.
Remaining loyal to the Toyotomi clan, Nagashige aligned himself with the Western forces under Ishida Mitsunari at the Battle of Sekigahara. This alliance resulted in the loss of his daimyo status and possessions. Recognizing Nagashige's value, Tokugawa Ieyasu granted him 10,000 koku and land at Futsuto in present-day Ibaragi Prefecture in 1603. The Niwa family name was fully reinstated after Nagashige's exemplary service in the Battles of Osaka in 1614 and 1615, where he fought under Tokugawa colors. He received lands at Edosaki along with 20,000 koku, followed by an increase to 50,000 koku and the Tanakura (Fukushima) Domain in 1622. In 1627, he was transferred to Shirakawa in modern-day Fukushima Prefecture, earning 100,700 koku. During his tenure, he expanded and reconstructed Komine Castle.
Niwa Nagashige breathed his last on April 30, 1637, just shy of his 66th birthday. His final resting place is at the Enmei-ji Temple in Shirakawa, Fukushima Prefecture, a testament to his enduring legacy in Japanese history.
See also
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Hattori Hanzo

Hattori Hanzō, also known by the name Hattori Masanari, was the third son of Hattori Yasunaga, a samurai who served the Matsudaira clan. In his childhood he was called Tigachi Hanzō. His father held the highest rank in the shinobi hierarchy, that of jōnin, and Hanzō followed in his father’s footsteps, choosing the same path.
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Hatano Hideharu

Hatano Hideharu was the eldest son of Hatano Harumichi, the head of the Hatano clan. However, in childhood he was adopted by his uncle, Hatano Motohide, and was therefore formally regarded as Motohide’s heir. From the time of Hideharu’s grandfather, Hatano Tanemichi, the Hatano clan had been a vassal of the powerful Miyoshi house, which exerted considerable influence over the Ashikaga shoguns and effectively shaped the political situation in the region. Early in his career, Hideharu served Miyoshi Nagayoshi and, judging by surviving records, held a fairly high position within his lord’s hierarchy, as he was among the select group invited to the enthronement ceremony of Emperor Ōgimachi in 1557.
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Fukushima Masanori

Fukushima Masanori, a samurai from Owari Province, served Toyotomi Hideyoshi and took part in the Battle of Shizugatake, where he distinguished himself so conspicuously that he was awarded the honorary title of one of the “Seven Spears of Shizugatake,” meaning the warriors who had shown the greatest valor in the battle. As a reward for his courage and martial prowess, he was granted land producing an income of 5,000 koku of rice.
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Uemura Masakatsu

Masakatsu was a member of the Uemura clan and the son of Uemura Masatada; from an early age he served Tokugawa Ieyasu. During the Ikkō-ikki uprising in Mikawa Province in 1563, having converted from the Jōdo Shinshū Buddhist sect to the Jōdoshū sect, he took part in suppressing the rebels. After these events, Masakatsu was appointed a military governor and was granted land holdings. According to a number of sources, he was one of the so-called “Three Governors of Mikawa” (Mikawa sanbugyō), together with Amano Yasukage (1537–1613) and Koriki Kiyonaga (1530–1608).
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Tomoe Gozen

Gozen is regarded as one of the few historically documented examples of true female warriors of feudal Japan, known as onna-musha or onna-bugeisha. Although Japanese history records countless women who at various times were forced to take up arms—for example, in defense of their castles—Tomoe Gozen was, without any doubt, a genuinely skilled and accomplished fighter. She was the wife of Kiso (Minamoto) Yoshinaka, although The Tale of the Heike describes her more as a female vassal. Yoshinaka rose in rebellion against the Taira clan and, in 1184, captured Kyoto after his victory at the Battle of Kurikawa. After the Taira were driven into the western provinces, Yoshinaka began insistently asserting that he alone was worthy of assuming leadership of the Minamoto clan and taking on the mantle of its head.
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Tachibana Muneshige

Tachibana Muneshige was born the eldest son of Takahashi Shigetane, one of the principal retainers of the Ōtomo clan and commander of Iwaya Castle. In childhood, he bore the name Senkumamaru. His early years coincided with a period of intense military confrontation between the Ōtomo clan and other powerful warrior houses of Kyūshū—namely the Shimazu, Akizuki, and Ryūzōji clans.
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Tachibana Dosetsu

Tachibana Dōsetsu is the name by which Hetsugi Akitsura is more widely known; the name of this lineage is also found read as Hekki or Bekki. For a long period, Akitsura served the Ōtomo clan, the daimyō of Bungo Province, and took part in wars against the Ōuchi family, the principal enemies of the Ōtomo in northwestern Kyushu. In the 1560s, Akitsura seized the castle of the Tachibana clan, which had rebelled against the Ōtomo, and thereafter adopted the surname Tachibana. Around the same time, he took Buddhist vows and assumed the name Dōsetsu, which means “Snowy Road.”
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Taira no Masakado

Taira no Masakado embodied the quintessential samurai of his era—self-assured, harsh, and unyielding. In his youth, he served in the palace guard and repeatedly proved his bravery while suppressing unrest. Thanks to these achievements, Masakado sought the post of chief of the capital’s military-police office (the kebiishi-chō), but he was rejected: by that time, nearly all court positions—now little more than privileged sinecures—were controlled by members of the powerful Fujiwara clan.
